Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1092:
1918, violet double overprint (type 1) on 35k brown violet and green, block of four, full OG, NH (1) or LH, VF, each stamp with Dr. Seichter guarantee hs, this variety is not listed in the Catalog, Est. $300-$350, Bulat #26 var
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